Pocomoke Sound is a bay of the Chesapeake Bay that forms part of the boundary between the Eastern Shores of Maryland and Virginia. The Pocomoke River is the largest stream feeding into the Sound, which is bounded by Somerset County, Maryland on the north, Worcester County, Maryland, Accomack County, Virginia, and Beasley Bay on the east, the Chesapeake Bay on the south, and Tangier Sound on the west. Its southwesternmost point may be considered to be Watts Island, Virginia.